Title: Contactless digital key switch

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Abstract: A contactless digital key switch is provided which comprises a plurality of printed circuit substrates each having a predetermined number of magnetic sensor chips longitudinally arranged thereon in spaced relation, the printed circuit substrates disposed in the form of polygon prism with the magnetic sensor chips facing inwardly, an actuating key member having one or more permanent magnets longitudinally arranged therein in spaced relation and in coded form, a rotary member adapted to receive the actuating key member and rotate with the same within the polygon prism defined by the printed circuit substrates, and means drivingly connected to the rotary member for permitting rotation of the rotary member with a snap action and holding the rotary member in a position where the permanent magnets face to the corresponding magnetic sensor chips on one of the printed circuit substrates every time the rotary member is rotated by a predetermined angle, whereby a coded signal corresponding to the permanent magnets arranged in coded form can be provided every time the actuating key member is rotated by the predetermined angle.


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